Synthesis, Crystal Structures and Molecular Packing of a Series of Pyrazolo-Benzothiazine Hybrid Derivatives
作者:Matloob Ahmad、Hamid Latif Siddiqui、Saeed Ahmad、Graham John Tizzard、Masood Parvez
DOI:10.1007/s10870-010-9820-9
日期:2010.12
The crystal structures of four derivatives of pyrazolo[4,3-c][1,2]benzothiazine-2,4-dihydro-3,4-dimethyl-,5,5-dioxide containing benzothiazine dioxide and pyrazolo fused rings that have been synthesized were determined. (C11 H11 N3 O2 S): Mr = 249.29, monoclinic, P21/c, a = 8.3070(3), b = 13.6331(5), c = 10.1661(3) Å, β = 106.924(2)°, V = 1101.45(7) Å3, Z = 4. (C12 H13 N3 O2 S): Mr = 263.31, monoclinic, P21/n, a = 9.729(3), b = 11.224(4), c = 11.436(3) Å, β = 98.85(2)°, V = 1233.9(7) Å3, Z = 4. (C14 H15 N3 O4 S): Mr = 321.35, monoclinic, P21/c, a = 9.2534(3), b = 19.3920(7), c = 7.9489(2) Å, β = 95.323(2)°, V = 1420.21(8) Å3, Z = 4. (C14 H15 N3 O3 S): Mr = 305.35, monoclinic, P21 /c, a = 13.816(7), b = 7.464(3), c = 14.674(8) Å, β = 109.05(3)°, V = 1430.3(12) Å3, Z = 4. The heterocyclic thiazine rings adopt half-chair conformations, and the mean-planes of the phenyl and pyrazolo rings lie between 10.43(11) and 15.93(16)° with respect to each other. In each case, the geometry about thiazine N-atom is trigonal pyramidal and only the first compound containing a donor N-atom shows classical hydrogen bonds. However, non-classical H-bonding of the type C–H···O is observed in all structures. The synthesis, crystal structures and molecular packing of four pyrazolo[4,3-c][1,2]benzothiazine-2,4-dihydro-3,4-dimethyl-5,5-dioxide derivatives have been presented.
测定了已合成的四种吡唑并[4,3-c][1,2]苯并噻嗪-2,4-二氢-3,4-二甲基-5,5-二氧化物衍生物的晶体结构,这些衍生物含有二氧化苯并噻嗪和吡唑并环。(C11 H11 N3 O2 S):Mr = 249.29,单斜,P21/c,a = 8.3070(3),b = 13.6331(5),c = 10.1661(3) Å, β = 106.924(2)°, V = 1101.45(7) Å3, Z = 4. (C12 H13 N3 O2 S):Mr = 263.31,单斜,P21/n,a = 9.729(3),b = 11.224(4),c = 11.436(3) Å, β = 98.85(2)°, V = 1233.9(7) Å3, Z = 4. (C14 H15 N3 O4 S):Mr = 321.35,单斜,P21/c,a = 9.2534(3),b = 19.3920(7),c = 7.9489(2) Å, β = 95.323(2)°, V = 1420.21(8) Å3, Z = 4. (C14 H15 N3 O3 S):Mr = 305.35,单斜,P21 /c,a = 13.816(7),b = 7.464(3),c = 14.674(8) Å,β = 109.05(3)°,V = 1430.3(12) Å3,Z = 4。杂环噻嗪环采用半椅构象,苯基环和吡唑环的平均平面相对于彼此的位置介于 10.43(11) Å和 15.93(16)Å 之间。在每种情况下,噻嗪 N 原子的几何形状都是三叉金字塔形,只有第一个含有供体 N 原子的化合物显示出经典氢键。然而,在所有结构中都观察到了 C-H-O 类型的非经典氢键。本文介绍了四种吡唑并[4,3-c][1,2]苯并噻嗪-2,4-二氢-3,4-二甲基-5,5-二氧化物衍生物的合成、晶体结构和分子包装。